ACS Sustainable Chemistry and Engineering
American Chemistry Society
School of Science / Centre for Marine Ecosystems Research
Australian Research Council
ARC Number : DE170101524
Copyright © 2020 American Chemical Society. Lignins from different parts of the seagrass Posidonia oceanica-namely sheaths, rhizome, and roots-as well as from fibrous balls from P. oceanica detritus were isolated and thoroughly characterized by pyrolysis coupled with gas chromatography/mass spectrometry, derivatization followed by reductive cleavage, two-dimensional nuclear magnetic resonance spectroscopy, and gel permeation chromatography. The lignins of P. oceanica were enriched in guaiacyl (G) over syringyl (S) units, with S/G ratios ranging from 0.1 (fibrous balls) to 0.5 (rhizome). β-O-4′ ethers and phenylcoumarans were the most abundant lignin substructures, followed by resinols, and minor amounts of dibenzodioxocins and spirodienones. Moreover, all lignins were found to be highly I-Acylated (up to 44% of total units), mainly with p-hydroxybenzoates but also, to a lesser extent, with acetates. The data indicated that this acylation extensively occurred in both G-and S-lignin units, contrary to what happens in palms, poplar, and willow, where p-hydroxybenzoates overwhelmingly appear at the I-position of S-units.
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Rencoret, J., Marques, G., Serrano, O., Kaal, J., Martínez, A. T., del Río, J. C., & Gutiérrez, A. (2020). Deciphering the unique structure and acylation pattern of Posidonia oceanica lignin. ACS Sustainable Chemistry & Engineering, 8(33), 12521-12533. https://doi.org/10.1021/acssuschemeng.0c03502